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Navy AM Class > Hydraulics 1 > Flashcards

Hydraulics 1 Flashcards

1
Q

Advantages of hydraulic systems

A

weight action maintenance and efficient

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2
Q

Disadvantages of hydraulics systems

A

Leakage and contamination

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3
Q

applied to a liquid causes liquid to expand and exert pressure

A

heat

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4
Q

transmitted undiminished in all directions

A

pressure

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5
Q

3 basic principles

A

force pressure and working area

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6
Q

exerted in pounds

A

force

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7
Q

exerted in pounds per square inch

A

pressure

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8
Q

expressed in square inches

A

working area

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9
Q

pressure exerted on an enclosed liquid is transmitted equally and undiminished in all directions and acts with equal force on all areas

A

pascal’s law

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10
Q

MARCH

A 
Manual bypass valve
Actuating cylinder
Reservoir
Check valves
Hand pump
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11
Q

located in the return line stops fluid when closed

A

Manual bypass valve

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12
Q

receives fluid pressure and transforms linear mechanical motion

A

Actuating cylinder

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13
Q

tank that holds the supply of fluid

A

reservoir

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14
Q

unit creates flow of fluid

A

hand pump

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15
Q

allows fluid flow in one direction only

A

check valves

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16
Q

the presence of undesirable foreign matter that may or may not be visible to the unaided eye

A

hydraulic fluid contamination

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17
Q

to achieve and maintain a satisfactory level of purity in hydraulic systems thereby providing for the safe efficient operation of naval aircraft and support equipment

A

hydraulic fluid contamination control program

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18
Q

particulate contamination may result from internal wear and failure of system components, maintenance malpractice, or poorly maintained support equipment

A

contamination sources

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19
Q

2 classifications of contamination

A

particulate and fluid

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20
Q

principle causes if wear in hydraulic pumps, actuators, valve, and servo valves

A

particulate contamination

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21
Q

3 parts of particulate contamination

A

organic solids
metallic solids
inorganic solids

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22
Q

4 types of fluid contamination

A

air
water
solvent
foreign

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23
Q

may be introduced through improper maintenance or a result of system design. can cause fire inside

A

air

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24
Q

adversely affect by dissolved, emulsified, or free water. separates from fluid and collects in filter bowls, and other critical locations

A

water

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25
Q

is a special form of foreign fluid contamination in which the original contaminating substance is a chlorinated solvent

A

solvent

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26
Q

generally the result of lube oil, engine, fuel, or incorrect hydraulic hydraulic fluid having been introduced inadvertently into the system during servicing

A

foreign

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27
Q

output greater than input required

A

mechanical advantage

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28
Q

Hydraulic system

A

sharp

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29
Q

SHARP

A 
Selector valve
Hydraulic lines
Actuating cylinder
Reservoir
Pump
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30
Q

hold supply fluid
provide space for thermal expansion
provide a means for bleeding air

A

Reservoir

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31
Q

create flow of fluid
draw fluid from the reservoir and send it out the system
primarily source of hydraulic power

A

Pump

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32
Q

to direct flow of fluid to and from actuating units

A

Selector valve

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33
Q

converts fluid energy into linear mechanical motion

A

actuating cylinders

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34
Q

converts hydraulic pressure into rotary mechanical motion

A

hydraulic cylinders

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35
Q

the medium for transmitting the fluid from one component to another

A

hydraulic lines

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36
Q

to protect internal parts of the cage from damage due to shocks and surges in the system

A

snubber

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37
Q

Fluid Characteristics

A

low viscosity
lubricating qualities
corrosion stability

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38
Q

viscosity is the resistance of a fluid to flow. viscosity of hydraulic fluid should be low and constant

A

low viscosity

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39
Q

the units in a hydraulic system are self-lubricated by the fluid flowing through them. it is necessary that the fluid has good lubrication qualities

A

lubricating qualities

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40
Q

hydraulic fluid must resist oxidation and inhibit corrosion

A

corrosion stability

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41
Q

to transmit energy

A

fluid

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42
Q

are used in naval aircraft and ground support equipement

A

synthetic based fluids

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43
Q

primary fluid fire-resistant type of fluid

A

MIL-PRF-83282

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44
Q

primarily used as a preservative for a hydraulic system in storage

A

MIL-H-46170

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45
Q

is to hold a supply of fluid for the system

A

reservoir

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46
Q

are not adapted to high-altitude flight or violent manuvers

A

non-pressurized

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47
Q

made of corrosion resistant metal and has a filler neck to provide a means of filling the reservoir with fluid

A

filler neck and housing

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48
Q

return port and the pump supply port

A

ports

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49
Q

inside of the tank in such a manner as to clean all returning fluid

A

filter

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50
Q

to prevent fluid flowing directly from the return line to the outlet of the pump and also to reduce surging and vortexing

A

baffle

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51
Q

electronic particle counter are the preferred method for measuring particle contamination

A

particle counters

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52
Q

size of the particulate matter in hydraulic fluid is measured in

A

microns

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53
Q

alternate method to measure hydraulic fluid contamination

A

patch testing

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54
Q

is to remove foreign matter from the contaminated fluid itself

A

decontamination method

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55
Q

four basic methods

A

re-circulation cleaning
purifying
flushing
purging

56
Q

to create a flow of fluid

location is determined by its source of power

A

hydraulic pump

57
Q

Pump displaces the same quantity of fluid on each revolution

A

Constant displacement pump

58
Q

Pump contains it’s own regulating device and can change pump displacement to meet the needs of the system

A

Variable displacement

59
Q

A constant displacement pump that consist of two mashed years, which revolve in a housing. One gear is driven by the driveshaft, the other is a driven gear

A

Gear pump

60
Q

Hand pump, double action pump, Vickers seven piston, and Vickers nine-piston

A

Piston pump’s

61
Q

Provides an emergency means of operating hydraulic units in the event of failure of the main pump, through two check valves

A

Hand pump

62
Q

Discharges fluid to the line of backstroke and forward stroke

A

Double action pump

63
Q

Is a constant displacement pump that consist of a housing, a rotating group, and a valve plate

A

Vickers seven piston

64
Q

Is a variable displacement pump that consist of a housing, a rotating group, a valve plate, a yoke, and a pressure control assembly

A

Vickers nine piston

65
Q

Pump repair I level replacement of gaskets o level

A

Maintenance

66
Q

To prevent damage to the power source of the pump in the event of the pump binding

A

Shear shaft

67
Q

Allows the reservoir to breathe

A

Vent line

68
Q

To show the fluid level in a reservoir

A

Fluid level indicators

69
Q

Ensure a constant fluid flow to the pump

A

Pressurized reservoir

70
Q

Regulator maintains a constant air pressure

A

Air fluid separated

71
Q

Can be installed anywhere before the pump and a hydraulic system

A

pressurized reservoir

72
Q

Is a primary concern is servicing hydraulic reservoir’s

A

Cleanliness

73
Q

Is located on or near reservoir that contains the following detailed info necessary. Fluid type, reservoir capacity, and caution notes

A

A plachr or Information plate

74
Q

To protect the hydraulic system from damage that could result from excessive pressure, caused by failure of the pump regulating devices, thermal expansion, and pressure surges

A

Hydraulic relief valves

75
Q

Relieve excessive pressure caused by thermal expansion

A

Thermal relief valves

76
Q

To protect the hydraulic system from excessive pressure by releasing hydraulic fluid from the pressure line into the return line

A

Main system relief valves

77
Q

The inlet and outlet bodies are threaded together around the valve sleeve

A

Housing

78
Q

A finish surface and acts as the cylinder chamber for the piston

A

Valve sleeve

79
Q

Contains the poppet valve that consist of the poppet, poppet Spring, cage, and adjusting nut

A

Inlet body

80
Q

Contains the spigot, load spring, and piston

A

Outlet body

81
Q

When the pressure of the hydraulic system reaches the opening pressure setting, and fluid flows through the valve into the return line

A

Opening

82
Q

When the pressure of the hydraulic system drops to the receding pressure and fluid flow through the valve ceases

A

closing

83
Q

When the pressure at the outlet port exceeds the pressure at the end report and fluid will flow to the pressure line

A

Free reverse valve

84
Q

On relief valves is limited to checking the valves for external leaks, proper relieving pressure if a relief valve failed to operate properly. Must be replaced

A

Maintenance

85
Q

Three parts of a hydraulic filter

A

Head assembly, filter element, and bowl

86
Q

Is to filter the fluid of the hydraulic system of foreign particles and contaminative substances

A

Hydraulic filters

87
Q

Nearest element in use, made of organic and inorganic fibers, bonded by proxy resin, with a metal screen on both sides to protect the system. 1 to 10 microns

A

5 micron disposable filter

88
Q

Made of stainless steel wire mash, can be cleaned and reused. 15 to 25 µm

A

Stainless steel filter

89
Q

Made of chemically treated paper formed in convolutions, or accordion please, to increase filter capability. 10 to 20 µm

A

Micronic filter

90
Q

Consist of Minuet bronze balls join together as one piece, but still remaining porous. 25 microns

A

Sintered filter

91
Q

Provides information on servicing filters of aircraft hydraulic systems

A

Maintenance instructions manual

92
Q

Provides inspection information and changing intervals of filters

A

Maintenance requirements cards

93
Q

Provides cleaning and testing information for filter elements

A

Aviation hydraulics manual

94
Q

Made only at I level

A

Adjustments

95
Q

Check for proper operation and check for external leakage

A

Installing

96
Q

Ensure that the pressure in the hydraulic system has been relieved

A

Removal

97
Q

To store hydraulic fluid under pressure for normal and emergency use

A

Hydraulic accumulators

98
Q

Aid pump at peak low demand

A

Normal

99
Q

If the pressure of the main system is lost, fluid that is stored under pressure in an accumulator of a sub system maybe used to actuate that subsystem

A

Emergency

100
Q

Absorbs shock and surges of fluid within plants and absorbs thermal expansion

A

Function

101
Q

Pressure line, screen disc, fluid chamber, diaphragm, nitrogen chamber, air valve cap

A

Spherical or diaphragm

102
Q

Chromium plated on inside end cap , fluid port, Barrel , piston, O-ring package and back up ring, and nitrogen port

A

Cylindrical or piston

103
Q

React to changes in the fluid pressure of the system

A

Accumulators

104
Q

Referred to ____To determine proper preload of the accumulator, standard removal or installation procedures, and other important instructions

A

Maintenance Instruction manual

105
Q

To reduce the pressure of the main system to a predetermined lower pressure in the subsystem

A

Pressure reducing valve

106
Q

Any pressure alarm of the main system just prior to the pressure line of the subsystem

A

Location of the pressure reducing valve

107
Q

Body and ports, sleeve and Shuttle assembly, relief valve spring, and a cap

A

Components of a pressure reducing valve

108
Q

Retaining flange, o ring gaskets, and sleeve holes

A

Sleeve

109
Q

Inner bore, seat, metering groove, Shuttle holes

A

Shuttle

110
Q

Determines the amount of reduced pressure in the subsystem

A

Relief valve spring

111
Q

Screws onto the body and hold the relief valve spring in the housing and an adjustment screw is Incorporated in the cap

A

Cap

112
Q

The shuttle is held in the unseeded position by the relief valve spring

A

Open position of the pressure reducing valve

113
Q

When pressure in the subsystem reaches its setting, the relief valve spring is over come

A

Balanced position of the pressure reducing valve

114
Q

Nitrogen pressure in an accumulator

A

Preloading

115
Q

Examine accumulators for external and fluid nitrogen leaks detect nitrogen leaks by brushing with soapy water, loosen air valves to check for internal leaks

A

Inspection

116
Q

The majority of accumulators enable aircraft are equipped with a gauge to check the preload

A

Pressure gauge method

117
Q

If the pressure of the subsystem becomes too great, the relief valve springs should be compressed further by the shuttle, and excessive pressure will be relieved by allowing fluid to be routed to the return port will relieve excessive pressure

A

Relief flow operation

118
Q

Referred to maintenance instruction manual if pressure reducing valve operates in properly

A

Maintenance

119
Q

Hydraulic system pressure must be the depressurized

A

Safety precautions

120
Q

Is to direct a fluid fluid to and from the actuating cylinder

A

Solenoid operated selector valve

121
Q

Body, sleeve, slide

A

Components of a solenoid operated selector valve

122
Q

Cast aluminum alloy that contains four fluid ports; pressure, return, and two cylinders

A

Body

123
Q

Hollow still sleeve inserted into the body bore. Pattern of holes have been drilled around it

A

Sleeve

124
Q

Seated inside the hollow sleeve

A

Slide

125
Q

Pressure that is obtained from the pressure port

A

Bleed pressure

126
Q

to control bleed pressure is the function of

A

To opposed solenoid

127
Q

Metal core, That is placed in the hollow center of the solenoid

A

Plunger

128
Q

Directly under the plunger

A

Plunger pin

129
Q

Located directly below each plunger pin

A

Ball

130
Q

One solenoid has been removed and a pug is installed in the solenoid cavity, one coil spring has been removed and an extended in Has been put in its place, and a double spring has been installed on the opposite end of the slide

A

Three-way, two position

131
Q

To convert hydraulic pressure into linear mechanical motion

A

Hydraulic actuating cylinders

132
Q

One in which fluid pressure may be directed to only one side of the piston

A

Double acting unbalanced

133
Q

Piston rod extending through the piston and out through both ends of the cylinder

A

Double acting balanced

134
Q

Inspect for signs of leakage, and take corrective actions, X ternal leakage is the most common trouble encountered

A

Maintenance

135
Q

To convert hydraulic pressure into Rotary mechanical motion. The direction of the rotation is controlled by selector valve

A

Hydraulic motors

Navy AM Class (7 decks)

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